电弧熔敷用高熵合金粉芯丝材熔敷层的摩擦磨损行为

Friction and wear be haviors of high-entropy alloy powder core wire for arc deposition

通过研究电弧熔敷不锈钢高熵合金粉芯丝材在不同摩擦条件下的摩擦磨损行为,为实现电弧现场快速修复和成形在耐磨性能方面提供可靠的保证。将高熵合金组成的Fe、Co、Ni、Cu四种金属元素以粉末按等原子比制成不锈钢高熵合金粉芯丝材,通过电弧熔敷方式熔敷在不锈钢表面。采用Nanovea Tribometer摩擦磨损仪和Nanovea PS50表面轮廓仪测试和分析焊道表面的耐磨性。高熵合金以FCC相不均匀散布在不锈钢焊层中,焊道耐磨损性能高于不锈钢基材,焊道磨损体积和磨损率均比基材及308粉芯焊丝降低30%,高熵合金的FCC相对不锈钢耐磨性能有强化作用。随着磨损载荷和速率的增加,高熵合金焊道的摩擦系数均逐渐降低,磨痕的深度、宽度、磨损体积均在增加;在当载荷为2 N、4 N,磨损速率为100 r/min、200 r/min时,焊层的耐磨性是不锈钢基材及JQ-308不锈钢粉芯丝材的1.5倍,主要表现为磨粒磨损和粘着磨损;当载荷为6 N、8 N,速率为300 r/min、400 r/min时,焊层的耐磨性是不锈钢基材及JQ-308不锈钢粉芯丝材的2倍,主要表现为粘着剥落磨损。将性能优异的高熵合金应以粉芯方式应用于电弧熔敷中,可实现实际环境下关键零部件现场电弧快速修复或表面强化。

Through studying the friction and wear behaviors of arc deposition of stainless steel high-entropy alloy powder core wires under different friction conditions,it can provide reliable guarantee in wear resistance for rapid repair and formation of arc in situ.Four metal elements,Fe,Co,Ni and Cu,consisting of high-entropy alloys,were made into stainless steel high-entropy alloy powder core wire by equal atomic ratio of powder.The wire was deposited on the surface of stainless steel by arc deposition.Nanovea Tribometer friction and wear tester and nanovea PS50 surface profiler were used to test and analyze the wear resistance of bead surface.High-entropy alloys are unevenly dispersed in stainless steel welding layer with FCC phase.The wear resistance of bead is higher than that of stainless steel.The wear volume and wear rate of bead are 30%lower than those of base metal and 308 powder core wire.The FCC phase of high-entropy alloys has a strengthening effect on the wear resistance of stainless steel.With the increase of wear load and wear rate,the friction coefficient of high-entropy alloy bead decreases gradually,and the depth,width and volume of wear mark increase.At the wear load of 2 N and 4 N and wear rate of 100 r/min and 200r/min,the wear resistance of layer is 1.5 times of stainless steel base material and JQ-308 stainless steel powder core wire,which is mainly characterized by abrasive wear.At the wear load of 6 N and 8 N and wear rate of 300 r/min and 400 r/min,the wear resistance of the layer is twice as much as that of the stainless steel base material and JQ-308 stainless steel powder core wire material,which is mainly characterized by adhesive and exfoliative wear.Applying the high-entropy alloy with exce-llent properties in arc deposition by the way of powder core can realize rapid arc repair or surface strengthening of key parts in the actual environment.